1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "@(#)largest_file.c 1.3 07/05/25 SMI" 28 29 #include "file_common.h" 30 #include <sys/param.h> 31 #include <signal.h> 32 #include <stdio.h> 33 34 /* 35 * -------------------------------------------------------------- 36 * 37 * Assertion: 38 * The last byte of the largest file size can be 39 * accessed without any errors. Also, the writing 40 * beyond the last byte of the largest file size 41 * will produce an errno of EFBIG. 42 * 43 * -------------------------------------------------------------- 44 * If the write() system call below returns a "1", 45 * then the last byte can be accessed. 46 * -------------------------------------------------------------- 47 */ 48 static void sigxfsz(int); 49 static void usage(char *); 50 51 int 52 main(int argc, char **argv) 53 { 54 int fd = 0; 55 off_t offset = (OFF_MAX - 1); 56 off_t lseek_ret = 0; 57 int write_ret = 0; 58 int err = 0; 59 char mybuf[5]; 60 char *testfile; 61 62 if (argc != 2) { 63 usage(argv[0]); 64 } 65 66 (void) sigset(SIGXFSZ, sigxfsz); 67 68 testfile = strdup(argv[1]); 69 70 fd = open(testfile, O_CREAT | O_RDWR); 71 if (fd < 0) { 72 perror("Failed to create testfile"); 73 err = errno; 74 goto out; 75 } 76 77 lseek_ret = lseek(fd, offset, SEEK_SET); 78 if (lseek_ret < 0) { 79 perror("Failed to seek to end of testfile"); 80 err = errno; 81 goto out; 82 } 83 84 write_ret = write(fd, mybuf, 1); 85 if (write_ret < 0) { 86 perror("Failed to write to end of file"); 87 err = errno; 88 goto out; 89 } 90 91 offset = 0; 92 lseek_ret = lseek(fd, offset, SEEK_CUR); 93 if (lseek_ret < 0) { 94 perror("Failed to seek to end of file"); 95 err = errno; 96 goto out; 97 } 98 99 write_ret = write(fd, mybuf, 1); 100 if (write_ret < 0) { 101 if (errno == EFBIG) { 102 (void) printf("write errno=EFBIG: success\n"); 103 err = 0; 104 } else { 105 perror("Did not receive EFBIG"); 106 err = errno; 107 } 108 } else { 109 (void) printf("write completed successfully, test failed\n"); 110 err = 1; 111 } 112 113 out: 114 (void) unlink(testfile); 115 free(testfile); 116 return (err); 117 } 118 119 static void 120 usage(char *name) 121 { 122 (void) printf("%s <testfile>\n", name); 123 exit(1); 124 } 125 126 /* ARGSUSED */ 127 static void 128 sigxfsz(int signo) 129 { 130 (void) printf("\nlargest_file: sigxfsz() caught SIGXFSZ\n"); 131 } 132